Accession Number : ADA134040

Title :   A Holographic Interferometry Technique for Measuring Transonic Flow near a Rotor Blade.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Kittleson,John K

PDF Url : ADA134040

Report Date : Aug 1983

Pagination or Media Count : 24

Abstract : A technique that uses holographic interferometry to record the first interferograms of the flow near a hovering transonic rotor blade is presented. A pulsed ruby laser is used to record interferograms of a 2-ft-diam field of view near a rotor tip operating at a tip Mach number of 0.09. Several interferograms, recorded along planes perpendicular to the rotor's tip-path-plane at various azimuthal angles around the flow, are presented. These interferograms yield quantitative information about shock structure and location, flow separation, and radiated noise that will help helicopter researchers understand the complexities of the flow around high-speed rotor blades and thus improve performance and reduce noise. (Author)

Descriptors :   *Interferometry, *Holography, *Transonic flow, Rotor blades(Rotary Wings), Three dimensional flow, Flow visualization, Flow separation, Compressible flow, Pulsed lasers, Ruby lasers, Tomography, Interferograms, Hovering, Helicopter rotors

Subject Categories : Holography
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE